Matchmaking error 2-0x0000D00C

I got stuck in a casual with a team of killers. They killed us the first round and attempted to kill us the second time, and I reacted. Unfortunately, this got me banned for 24 hours. I decided to play custom games the whole day with my friends... That was at about 6pm last night. Now, its about 7pm the next day. The ban alert is gone, but I cannot log in and I get a matchmaking error: 2-0x0000D00C saying I can't a match... Can somebody help me out?